Data

Exploration

Tables

Table 1: Summary statistics by Species

Petal.Length
Min. 1st Qu. Median Mean 3rd Qu. Max.
setosa 1.0 1.4 1.50 1.46 1.58 1.9
versicolor 3.0 4.0 4.35 4.26 4.60 5.1
virginica 4.5 5.1 5.55 5.55 5.88 6.9
Petal.Width
Min. 1st Qu. Median Mean 3rd Qu. Max.
setosa 0.1 0.2 0.2 0.25 0.3 0.6
versicolor 1.0 1.2 1.3 1.33 1.5 1.8
virginica 1.4 1.8 2.0 2.03 2.3 2.5

Table 2: Linear model Petal.Width ~ Petal.Length by species

Estimate Std. Error t value Pr(>|t|)
setosa
(Intercept) -0.05 0.12 -0.40 0.69
Petal.Length 0.20 0.08 2.44 0.02
versicolor
(Intercept) -0.08 0.16 -0.52 0.60
Petal.Length 0.33 0.04 8.83 0.00
virginica
(Intercept) 1.14 0.38 2.99 0.00
Petal.Length 0.16 0.07 2.36 0.02

Figures

Figure 1: Kernel density estimates

Figure 2: Linear models